Wavelength and defocus margins of the collinear holographic storage system

Li, Jianhua; Cao, Liangcai; Gu, Huarong; Tan, Xiaodi; He, Qingsheng; Jin, Guofan

doi:10.1117/12.870349

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…Holographic optical storage is a powerful candidate for the next generation of enormous data storage, owing to its fast data transfer rate, high storage capacity, and long storage life [1][2][3][4][5][6]. Compared with the traditional off-axis type of holographic storage system, the collinear type is a more compact system and has better stability [7][8][9][10], which enables easy miniaturization [11], and has a larger wavelength margin [12]; moreover, a semiconductor laser can be applied to the system. In addition, a collinear holographic storage system can be combined with a servo system, and the compatibility and vibration resistance of the storage system would also become stronger [13,14].…”

Section: Introductionmentioning

confidence: 99%

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

et al. 2022

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Holographic optical storage has great potential for enormous data storage, although the recording medium can cause dimensional change, which can deteriorate the quality of the reconstructed hologram. Compensation in traditional off-axial holographic storage systems is sensitive to vibration and requires high precision. In contrast, a collinear system is more compact with better stability, and its compensation would be different. In this paper, the combination compensation method for compensating for the dimensional change of the recording medium by simultaneously adjusting the reading light wavelength and the focal length of the objective lens is established, which was implemented in a collinear system for a high dimension-change-rate (σ) of the medium condition. Its compensation effects for the lateral dimension change and the vertical dimension change were compared as well. The results show that the bit error ratio of the reconstructed hologram could be decreased to 0 for both of the dimensional change conditions with a large adjustment scope under σ = 1.5%. Compared with the compensation method, in which only the focal length or the wavelength are adjusted, this combination compensation method can enlarge the compensation scope and improve the tolerance of the recording medium shrinkage in a collinear holographic storage system.

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Section: Introductionmentioning

confidence: 99%

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

et al. 2022

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“…* clc@mail.tsinghua.edu.cn; phone 86-10-62781204 The uploaded signal pattern and reference pattern on the SLM are 0 0 0 ( , ) S x y and 0 0 0 ( , ) R x y , respectively. The field distribution of the signal beam and reference beam [13], located at a distance of z from the rear focal plane of lens 1 , can be derived as…”

Section: Introductionmentioning

confidence: 99%

Crosstalk analysis of multilayer collinear volume holographic data storage

Liu

Cao

et al. 2013

SPIE Proceedings

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An optical model to describe the reconstructed image of the collinear holographic data storage system is presented. The 2-D shape of the recording spot in the medium is simulated. The system structure parameters that influence the signal-to-noise ratio (SNR) of the reconstructed image are investigated in order to choose proper optical components to improve data storage density of the system. The role of the random binary phase mask (RBPM) utilized in the multilayer collinear holographic system is investigated. It is proved that the inter-layer crosstalk can be effectively suppressed by using different RBPMs. Different layers of data pages can be recorded with the SNR increased by a factor of six at least and the shift selectivity along z-axis can also be improved significantly.

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“…Its optical setup is compact and tolerant to disturbances of the environment, such as mechanical vibration [5,6], temperature variation [7,8], and wavelength shift [9,10], which makes producing the practical holographic data storage systems easier than the conventional two-axis holography. In CHDS, the reference pattern (RP) and the signal pattern are uploaded simultaneously on the same spatial light modulator (SLM) [11,12].…”

Section: Introductionmentioning

confidence: 99%

Orthogonal reference pattern multiplexing for collinear holographic data storage

Cao

Liu

et al. 2013

Appl. Opt.

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An orthogonal reference pattern multiplexing (ORPM) method for collinear holographic data storage (CHDS) is investigated to increase the data storage density and realize parallel optical image superimposition. Holograms are multiplexed in the same volume of the recording medium with multiple orthogonal reference patterns (RPs). The physical principle of this method is analyzed based on scalar diffraction theory. The orthogonal condition of the RPs is derived in order to suppress the interpage cross talk. The parameters of the radial-line RP have significant influence on the signal-to-noise ratio (SNR) of the reconstructed data page. They are optimized to reduce the intrapage cross talk. With a random binary phase mask (RBPM) located closely before the spatial light modulator, SNR of the reconstructed data page is seven times the SNR without the RBPM. Three data pages are multiplexed in the same volume of the medium using the ORPM method. The reconstructed data pages for the CHDS system show the effectiveness of the RBPM in suppressing the intrapage and interpage cross talk.

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Wavelength and defocus margins of the collinear holographic storage system

Cited by 3 publications

References 12 publications

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

Combination Compensation Method to Improve the Tolerance of Recording Medium Shrinkage in Collinear Holographic Storage

Crosstalk analysis of multilayer collinear volume holographic data storage

Orthogonal reference pattern multiplexing for collinear holographic data storage

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